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I've pulled some blower wheels when changing motors to see secondary HX coated in dirt, but I still got 20*...that one makes me wonder how in the world they did get it. But I did the job, and got the unit done, but wow, I've NEVER had anything like that, even when the HO left the damn filter OFF!

(The wise men of modern thought) adore a god made of putty or of wax - plastic, effeminate, molluscous, with no masculine faculty about him, and no quality that entitles him to the respect of just and honest men, for a being who cannot be angry at wrongdoing is destitute of one of the essential virtues, and a moral Ruler who is not angry with the wicked, and who refuses to punish crime, is not divine. ---Spurgeon

had customer tell me she had a self cleaning filter. When the filter gets dirty just flip it over and nothing else to worry about. Someone had wrote with a marker the month and day that it was installed it had been "self cleaning" for 3 years.

I love it when people think they know what there talking about (do it your selfers) when it comes to the PM's on there units. I myself have heard of the infamous self cleaning filter by some customer i had. Pulled the thing out... it was a regular 1" pleated filter... ARE YOU SERIOUS?!?!?

the new filter is usually a warning.
I got scolded by a customer once for pointing out that the old filter, that looked like a piece of cardboard, in the trash can was the issue.
trash can few feet from cond, it was sticking out so I had to look.
unit checked out fine and no call back.

Had a few convenience stores that had icing up problems. Before I went into store to check unit, I got into habit of checking dumpster to see if there were dirty filters inside...never failed, they were right on top of trash. Old filters had dates and initials of my company written on them. Cause of issues was dirty filters and when confronting store manager, he had nothing to say. Dirty filters were store manager's responsibility and parent company would not pay for service call if filter related, company would back-charge store for call. They never learned!!!

The only thing better would be if the filter had been on the supply side of the furnace! ha

Two systems kept on blowing out the supply ducting. Eventually someone discovered a media filter had been placed in the supply trunk of each system. The trunk had been wrapped in additional insulation and the door to the filter cabinet had been covered up.
Hackery on top of hackery. cost the customer a lot of grief until it was found and corrected.

“I am for doing good to the poor, but...I think the best way of doing good to the poor, is not making them easy in poverty, but leading or driving them out of it. I observed...that the more public provisions were made for the poor, the less they provided for themselves, and of course became poorer. And, on the contrary, the less was done for them, the more they did for themselves, and became richer.”
― Benjamin Franklin